Case: Patient 19, female, 33yo, symptom onset in childhood

CasePresentingHPOs: HP:0009027, HP:0008959, HP:0009053, HP:0008997, HP:0008994, HP:0002650, HP:0003458 (foot drop, Distal upper limb muscle weakness, Distal lower limb muscle weakness, Proximal muscle weakness in upper limbs, Proximal muscle weakness in lower limbs, scoliosis, EMG: myopathic abnormalities)

HPOsFreeText: respiratory involvement - restrictive from 25yo, normal CK levels, minicores present on muscle biopsy

CaseNotHPOs: no cardiac involvement

FamilyInfo: family history

DiseaseEntity: no assertion

InheritancePattern: no assertion

CasePreviousTesting: see below

CaseGenotypingMethod: 9 cases underwent targeted Sanger sequencing of MYH7, 12 cases underwent Motorplex analysis (NGS of 93 myopathy-related genes - PMID:25214167), all MYH7 variants confirmed via Sanger sequencing, segregation analysis performed on available family members, which cases received which sequencing technique is not specified

Variant: NM_000257.4(MYH7):c.4844_4846AGA[2] (p.Lys1617del)

ClinVar: 190401, https://www.ncbi.nlm.nih.gov/clinvar/variation/190401/

gnomAD: absent

Case: Patient 4, male, 22yo, symptom onset in childhood

CasePresentingHPOs: HP:0009027, HP:0003327, HP:0008959, HP:0009053, HP:0001701, HP:0030682 (foot drop, axial muscle weakness, distal upper limb muscle weakness, distal lower limb muscle weakness, pericarditis, left ventricular noncompaction)

CaseNotHPOs: HP:0003306 (rigid spine)

HPOsFreeText: restrictive respiratory involvement from age 16, CK = 711U/l, minicores present on muscle biopsy, hypertrophy of gastrocnemii

FamilyInfo: no family history

DiseaseEntity: no assertion

InheritancePattern: no assertion

CasePreviousTesting: see below; variants in SEPN1 and LMNA rules out

CaseGenotypingMethod: 9 cases underwent targeted Sanger sequencing of MYH7, 12 cases underwent Motorplex analysis (NGS of 93 myopathy-related genes - PMID:25214167), all MYH7 variants confirmed via Sanger sequencing, segregation analysis performed on available family members, which cases received which sequencing technique is not specified

Variant: NM_000257.4(MYH7):c.4844_4846AGA[2] (p.Lys1617del)

ClinVar: 190401, https://www.ncbi.nlm.nih.gov/clinvar/variation/190401/

gnomAD: absent

Case: Patient 8, male, 35yo, symptom onset in childhood

CasePresentingHPOs: HP:0009027, HP:0003327, HP:0002460, HP:0002650, HP:0003458 (foot drop, axial muscle weakness, distal muscle weakness, scoliosis, EMG: myopathic abnormalities)

HPOsFreeText: CK = 720U/l, neurogenic EMG, cores present on muscle biopsy

CaseNotHPOs:

NotHPOsFreeText: no respiratory or cardiac involvement

FamilyInfo: pedigree in Figure 1

DiseaseEntity: no assertion

InheritancePattern: no assertion

CasePreviousTesting: see below

CaseGenotypingMethod: 9 cases underwent targeted Sanger sequencing of MYH7, 12 cases underwent Motorplex analysis (NGS of 93 myopathy-related genes - PMID:25214167), all MYH7 variants confirmed via Sanger sequencing, segregation analysis performed on available family members, which cases received which sequencing technique is not specified

Variant 1: NM_000257.4(MYH7):c.4844_4846AGA[2] (p.Lys1617del)

ClinVar: 190401, https://www.ncbi.nlm.nih.gov/clinvar/variation/190401/

gnomAD: absent

Variant 2: NM_000257.4(MYH7):c.4855G>A(p.Glu1619Lys)

ClinVar: 181268, https://www.ncbi.nlm.nih.gov/clinvar/variation/181268/

gnomAD: absent